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pkg/fileutil: clean up interface, comments

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This commit is contained in:
Gyu-Ho Lee 2016-03-09 09:19:56 -08:00
parent a4624666fe
commit 22a8bbd3b1
5 changed files with 29 additions and 44 deletions
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29
pkg/fileutil/lock.go Normal file
View File

@ -0,0 +1,29 @@
// Copyright 2016 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fileutil
type Lock interface {
// Name returns the name of the file.
Name() string
// TryLock acquires exclusivity on the lock without blocking.
TryLock() error
// Lock acquires exclusivity on the lock.
Lock() error
// Unlock unlocks the lock.
Unlock() error
// Destroy should be called after Unlock to clean up
// the resources.
Destroy() error
}

11
pkg/fileutil/lock_plan9.go
View File

@ -25,14 +25,6 @@ var (
ErrLocked = errors.New("file already locked")
)
type Lock interface {
Name() string
TryLock() error
Lock() error
Unlock() error
Destroy() error
}
type lock struct {
fname string
file *os.File
@ -42,7 +34,6 @@ func (l *lock) Name() string {
return l.fname
}
// TryLock acquires exclusivity on the lock without blocking
func (l *lock) TryLock() error {
err := os.Chmod(l.fname, syscall.DMEXCL|0600)
if err != nil {
@ -58,7 +49,6 @@ func (l *lock) TryLock() error {
return nil
}
// Lock acquires exclusivity on the lock with blocking
func (l *lock) Lock() error {
err := os.Chmod(l.fname, syscall.DMEXCL|0600)
if err != nil {
@ -75,7 +65,6 @@ func (l *lock) Lock() error {
}
}
// Unlock unlocks the lock
func (l *lock) Unlock() error {
return l.file.Close()
}

11
pkg/fileutil/lock_solaris.go
View File

@ -26,14 +26,6 @@ var (
ErrLocked = errors.New("file already locked")
)
type Lock interface {
Name() string
TryLock() error
Lock() error
Unlock() error
Destroy() error
}
type lock struct {
fd int
file *os.File
@ -43,7 +35,6 @@ func (l *lock) Name() string {
return l.file.Name()
}
// TryLock acquires exclusivity on the lock without blocking
func (l *lock) TryLock() error {
var lock syscall.Flock_t
lock.Start = 0
@ -59,7 +50,6 @@ func (l *lock) TryLock() error {
return err
}
// Lock acquires exclusivity on the lock without blocking
func (l *lock) Lock() error {
var lock syscall.Flock_t
lock.Start = 0
@ -70,7 +60,6 @@ func (l *lock) Lock() error {
return syscall.FcntlFlock(uintptr(l.fd), syscall.F_SETLK, &lock)
}
// Unlock unlocks the lock
func (l *lock) Unlock() error {
var lock syscall.Flock_t
lock.Start = 0

11
pkg/fileutil/lock_unix.go
View File

@ -26,14 +26,6 @@ var (
ErrLocked = errors.New("file already locked")
)
type Lock interface {
Name() string
TryLock() error
Lock() error
Unlock() error
Destroy() error
}
type lock struct {
fd int
file *os.File
@ -43,7 +35,6 @@ func (l *lock) Name() string {
return l.file.Name()
}
// TryLock acquires exclusivity on the lock without blocking
func (l *lock) TryLock() error {
err := syscall.Flock(l.fd, syscall.LOCK_EX|syscall.LOCK_NB)
if err != nil && err == syscall.EWOULDBLOCK {
@ -52,12 +43,10 @@ func (l *lock) TryLock() error {
return err
}
// Lock acquires exclusivity on the lock without blocking
func (l *lock) Lock() error {
return syscall.Flock(l.fd, syscall.LOCK_EX)
}
// Unlock unlocks the lock
func (l *lock) Unlock() error {
return syscall.Flock(l.fd, syscall.LOCK_UN)
}

11
pkg/fileutil/lock_windows.go
View File

@ -25,14 +25,6 @@ var (
ErrLocked = errors.New("file already locked")
)
type Lock interface {
Name() string
TryLock() error
Lock() error
Unlock() error
Destroy() error
}
type lock struct {
fd int
file *os.File
@ -42,17 +34,14 @@ func (l *lock) Name() string {
return l.file.Name()
}
// TryLock acquires exclusivity on the lock without blocking
func (l *lock) TryLock() error {
return nil
}
// Lock acquires exclusivity on the lock without blocking
func (l *lock) Lock() error {
return nil
}
// Unlock unlocks the lock
func (l *lock) Unlock() error {
return nil
}